A sample 10-bus power network is shown in Figure1 and its data are listed in Table 1 and Table 2. All impedance data are given in per unit with a base voltage of 500 KV and base voltampere of 100 MVA. The positive- and negative-sequence impedances are assumed to be equal. Bus number Line,number 1(52.58) Line length 2(33.2 (47.9) 4(56.88) 5(42.45) 6(27.99 10(27.22) 9(86.81) 7(63.51) 8(62.77) Source 10 Figure 1. A sample 10-bus power system Table 1 Source impedances of the sample system Source Positive sequence Zero sequence us 0.0018296j0.013763 6 0.00016441 j0.0046618 0.00017024 +j0.0028855 0.0056571+j0.03134 0.0026958 j0.022641 0.00020591 + j0.004648 0.00052175+j0.0047921 0.001006j0.016521 71 0.0016382 0.024301 0.0014553 + j0.023504 10 A sample 10-bus power network is shown in Figure1 and its data are listed in Table 1 and Table 2. All impedance data are given in per unit with a base voltage of 500 KV and base voltampere of 100 MVA. The positive- and negative-sequence impedances are assumed to be equal. Bus number Line,number 1(52.58) Line length 2(33.2 (47.9) 4(56.88) 5(42.45) 6(27.99 10(27.22) 9(86.81) 7(63.51) 8(62.77) Source 10 Figure 1. A sample 10-bus power system Table 1 Source impedances of the sample system Source Positive sequence Zero sequence us 0.0018296j0.013763 6 0.00016441 j0.0046618 0.00017024 +j0.0028855 0.0056571+j0.03134 0.0026958 j0.022641 0.00020591 + j0.004648 0.00052175+j0.0047921 0.001006j0.016521 71 0.0016382 0.024301 0.0014553 + j0.023504 10